Messier 32

ARP 168 2015 Sep 12

Object:       M32          (Arp 168)

Date:               2015 September 12

(and September 17)

Constellation:           Andromeda Time & altitude:   23.40 UT       71º
Catalogue data: Seeing (5 high):                               3/5
            R.A:                00h 43m Transparency (5 high):                   4/5
            Dec:                +40º 52 Telescope:     0.5m f4.1 Dob.
            Magnitude     9.0 Eyepiece:      8mm Ethos      x260
            Galaxy size (min)     8.7 x 6.4 Filters:            None.


Satellite of M31 and either inside, or seen against or through, M31’s halo. Arp 168 seems to lie on the end of a stream in M31’s halo which comes in from the N or NE. The NW edge of this stream is defined by a darker area or lane. I could not see the faint diffuse plume that Arp noted. Arp 168 itself is slightly oval, say 7:8, with the major axis pointing approximately to the core of M31. It has a bright almost stellar core and the halo is grainy – is this partial resolution into stars? Re-observed the galaxy on September 17 in similarly excellent seeing to confirm certain features in the September 12 drawing.